#18385: deallocate pari when sage quits
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Reporter: | Owner:
ncohen | Status: needs_info
Type: | Milestone: sage-6.7
defect | Resolution:
Priority: major | Merged in:
Component: | Reviewers:
memleak | Work issues:
Keywords: | Commit:
Authors: | 9bb69f848059d05ecb6566fa99d6e5d0624b6fa1
Report Upstream: N/A | Stopgaps:
Branch: |
public/18385 |
Dependencies: |
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Comment (by nbruin):
Replying to [comment:9 jdemeyer]:
> The problem isn't that `pari` is never deallocated, the problem is
apparently that Cython global variables are never deallocated.
A little googling gives me the impression that this is a wide-spread
problem with python (extension) modules: there is no way to "unload" a
module (which would be the time to deallocate global variables), and it
seems it doesn't exist because people haven't been able to solve the
subtle problems that arise in deciding when and in what order unloading
should happen (especially extension modules seem to be complicated this
way)
Indeed, without extra information, the fact that arbitrary code could be
executed upon deallocation means there is no sure-fire way to decide a
correct way to order module deallocation. It wouldn't be hard to write 2
modules A and B such that the deallocation code of one requires the other
module to be functional. One would require a rather careful protocol
specification to allow module deactivation.
Without extra information, you cannot start deallocating global variables
unless you know the module has been "deactivated". So I think Cython in
general will not be solving this problem any time soon.
--
Ticket URL: <http://trac.sagemath.org/ticket/18385#comment:10>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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